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'Inert pair effect' is shown by...

'Inert pair effect' is shown by

A

Tl

B

Pb

C

Bi

D

All of these

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The correct Answer is:
D
In case of heavy members of elements of p-block (like TI, Pb, Bi) the energy required to unpair the `ns^(2)` electrons is not compensated by energy released in forming two additional bonds. Thus, these s-electrons does not take part in bonding and this reluctance of s-electrons to participate in bonding is called inert pair effect.
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